All things were made for the only-begotten Son of God (Colossians 1:16). The Father has prepared for Him a wedding banquet (Matthew 22:2) and created man to partake in His celebrations. Had this gone as planned, the whole of creation, in Heaven and Earth, would sing His praises eternally, and God would be “all in all” (1 Corinthians 15:28). Unfortunately, the plan was messed up, starting with Satan and continuing with Adam & Eve. The creature rebelled against the Creator, and hope seemed lost.
Now what? The Holy Trinity, perfection by Itself, could have certainly left the human race in its sin. God created man, but He doesn’t need him by any means. He made him out of nothing, and didn’t need to make him at all. However, “God is love, in Whom there is no darkness” (1 John 1:5). Love Itself, desiring only what is best for all things, decided on a Plan B, so that sin would not be the final outcome. The Bridegroom, for Whom all things were created, Himself the spoken Word which brought order to the universe at creation, decided to once again bring about order by “emptying Himself, taking the form of a servant” and “becoming obedient unto death, even death on a cross” so that He might “make all things new” (Philippians 2:7-8, Revelation 21:5).
The Father and Holy Spirit, agreeing with the Son’s plan, addressed Satan with the following statement: “I will put enmity between you and the woman, and between your seed and her seed. She will crush your head, and you will strike at her heel” (Genesis 3:15). [Note, most Bibles render it that He, the seed, will crush the head. Both are acceptable, however].
God, the master logician, determined that if sin was brought about by a woman, it must be undone by a woman. This woman would be sinless, since enmity would exist between her and Satan. Her seed, too, would be sinless for that same reason. It makes sense, really, that she would be sinless. Because in the plan of the Three Persons, God the Son, God the Orderer, would be the One to condescend to human frailty. Only a sinless mother would be at all fit to bear God for nine months, and raise Him in childhood and adolescence. If the incarnate Son really was “like us in all things but sin” (Hebrews 4:15), then He would have to obey the same commandments we do, specifically, honoring His mother, which involves obedience. If she were sinless, she would be perfectly attuned to the Father’s will, and so the Son could obey her perfectly in all things.
There was another reason that the woman, destined to be the mother of the Son, would need to be sinless. The Son, Who would make a new creation by His “Plan B”, would become a new Adam. Yet Adam and Eve go together, so if there was to be a new Adam, there would also need to be a new Eve. The two would be in utter contrast to the first Adam and the first Eve. The first sinned; the second would be sinless. The first brought death to the world; the second would bring life. The first Eve was brought forth from Adam, yet that order would be reversed in the case of the second Adam and second Eve. The second Adam would be brought forth from the new Eve, so as to fulfill most perfectly God’s prophecy.
This woman, this new Eve, is Mary. Isn’t she wonderful?